Provide more useful exampels (#1864)
Provide more useful exampels (#1864)

change input data of String.downcase
doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,nscyclone/elixir-school